Originally Posted by Beer Belly
I was told at a gun shop that to add a new suppressor to the trust that everyone on the trust would have to get a new background check each time.

As per ChatGPT:
Quote
The short answer is no—not everyone on the trust completes a Form 4473 or NICS check every time you add an item to the trust.

Here's how it generally works:

When your trust is applying to acquire a new NFA item (such as on an ATF Form 4 transfer or Form 1 making application), every "responsible person" on the trust must:
Complete an ATF Form 5320.23 (Responsible Person Questionnaire).
Submit fingerprints and a passport-style photo.
Undergo an ATF background check as part of the application process.
Form 4473 and the NICS check at pickup are different.
The person who actually picks up the NFA item from the dealer typically completes the Form 4473.
Because all responsible persons have already been background checked during the NFA application process, a separate NICS check generally is not required for a responsible person picking up the item.
What if you add someone to the trust later?

If you add a new trustee/responsible person after an NFA item has already been approved and registered to the trust, you do not have to notify the ATF or submit fingerprints, a Form 5320.23, or a 4473 just because you amended the trust. However, the next time the trust applies to make or receive another NFA firearm, that new responsible person will have to submit the required paperwork and undergo the ATF background check with the application.

If you're asking because you're planning to buy another suppressor or SBR through your trust, I can also explain the common strategy people use to minimize repeated fingerprint and photo submissions while staying compliant.